<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
         android:drawable="@drawable/btn_back_pressed"/> 
	<item android:state_selected="true"
         android:drawable="@drawable/btn_back_pressed"/>    
    <item android:drawable="@drawable/btn_back_normal"/>  
              
 </selector>
 